"Cisco VNI projections indicate that IP traffic will increase at a combined annual growth rate (CAGR) of 46 percent from 2007 to 2012, nearly doubling every two years. This will result in an annual bandwidth demand on the world's IP networks of approximately 522 exabytes2, or more than half a zettabyte."
http://news.cnet.com/8301-13846_3-10145480-62.html
